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View Poll Results: How many blowouts have you had, and when did you have them? (select multiple answers)
1 blowout - in the heat of the summer (outside temp ABOVE 80 degrees) 9 50.00%
2 blowouts - in the heat of the summer (outside temp ABOVE 80 degrees) 4 22.22%
3 blowouts - in the heat of the summer (outside temp ABOVE 80 degrees) 2 11.11%
4 blowouts - in the heat of the summer (outside temp ABOVE 80 degrees) 0 0%
5 blowouts - in the heat of the summer (outside temp ABOVE 80 degrees) 0 0%
1 blowout - outside temp BELOW 80 degrees 3 16.67%
2 blowouts - outside temp BELOW 80 degrees 2 11.11%
3 blowouts - outside temp BELOW 80 degrees 0 0%
4 blowouts - outside temp BELOW 80 degrees 0 0%
5 blowouts - outside temp BELOW 80 degrees 0 0%
Multiple Choice Poll. Voters: 18. You may not vote on this poll

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Old 07-20-2010, 08:39 AM   #1
ShrimpBurrito
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Default When did you have your tire blowouts?

With my 2 well inflated Kumho tires blowing out on our last trip, at only 3 years of age, I'm starting to think that while age may be a contributing factor in tire failures, there is some other significant factor at play. The first one blew just 60 miles after leaving the house; the other blew 48 hours and 750 miles later.

I also had 1 Marathon blow out 3 years ago at the end of a 3,500 mile trip just 40 miles from home. But that tire was at least 7 years old, so while I was lucky they didn't all blow out earlier in the trip, I had just chalked up the failure to age, and age alone.

But with the Kumho blowouts, I'm convinced something else is going on. What was common amongst all my blowouts?
  • the TM was fully loaded, but not beyond the weight normally carried on other shorter trips throughout the year
  • I was traveling at 60 MPH on the freeway
  • the tire was adequately inflated
  • the temperature outside was HOT

What was NOT common?
  • the wheel bearings were freshly packed when the Kumho's failed; I had taken the TM on a trip immediately prior to the failure however, and the hubs ran cool, so I know hot bearings did not contribute to failure. The Marathon failed on our way home from buying the TM, so who knows when the bearings were packed.
  • age - the Marathon was at least 7 years old from date of manufacture, the Kumho was 3 years old

So from this, I think one can make a few guesses as to what is contributing to failure:
  • age
  • weight
  • heat

Of those factors, heat was the only factor that was new at the time of failure. Age and weight hadn't changed on all the trips we had done in the past year, but with all three failures, temperatures were in the high 90s or low 100s. On the way home on this last trip, I had bought a TST tire monitor, on suggestions from folks here, and tire temperatures were consistently 10-20 degrees higher than ambient temps. That meant the Kumhos could have been as hot as 120 degrees. We saw temps on our new 15" tires of ~130 degrees while coming back from southern Utah, through Vegas, until about 20 miles outside LA. The default temperature was the temp alarm to go off on the TST system is 158 degrees, so that gives a baseline at least of how hot the tires shouldn't get.

So let's do a poll. You can select multiple answers. I bet the people having blowouts outside of the heat of the summer are in the minority.

Dave
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Old 07-20-2010, 09:17 AM   #2
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Dave: Great poll idea, but you left out what I consider to be critical...rubber or steel valve stems. Could that be added?
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Old 07-20-2010, 09:29 AM   #3
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Unfortunately, no. The poll option only allows one question per thread; that's why I combined the "how many" and "when" questions, making 10 answers, which is the max. We can add another thread though, perhaps working from the data obtained in this poll.

Dave
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Old 07-20-2010, 07:12 PM   #4
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My dual blowout was in December 2006 in East Texas - but I'm 90% sure it was caused by road debris. Part of one of those black rubber straps with S hooks on them was wrapped around the axle. I still don't know how it got both tires though. Maybe when one failed, the other one was overloaded and failed. Ironically I had just gotten the TPMS for Christmas and it got me off the road before the tires came apart. I actually didn't need the test of its functionality that badly!
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Old 07-20-2010, 07:56 PM   #5
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I would not read anything into the 158 degree alarm limit on the TST monitor. When I got mine just after they came out, I asked the folks selling them how I could lower that limit and why it was set there. They said the monitor was designed originally for 18 wheelers ( whole different animal) and that the number was just one that was pulled out of the air. I have never seen anything over 105 even on 100 degree days at 55 mph. Interesting enough the temps seem to go down while driving and go back up during stop and go ( where there is no air flow to cool them).
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Old 07-20-2010, 08:03 PM   #6
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Bob,

Yea, I too was wondering were that 158 degree number came from, and presumed it may have had something (??) to do with the fact the systems were originally designed for 18-wheelers.

I too noticed the temp readings go up while standing still, and then go back down after driving. But I'm not sure that's actual tire air temp vs. simply the temp of the sensor, especially in the sun. I wouldn't think the sensor would take nearly as long to heat up as the tire.

I'm very interested in the fact you aren't seeing temps more than 5 degrees above ambient. What are other folks seeing?

wmtire - I hope you'll chime in here. What's a good upper operating temperature?

Dave
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Old 07-20-2010, 09:30 PM   #7
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Quote:
Originally Posted by ShrimpBurrito View Post
I bet the people having blowouts outside of the heat of the summer are in the minority.

Dave
That's a pretty safe bet given that the great majority of TT travel happens in the summer. You'd have to factor that into the equation.

I was surprised about your Kumho's. Don't they have a significantly higher load rating than the Marathons?

Keith
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Old 07-20-2010, 10:00 PM   #8
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Quote:
Originally Posted by Bluegrass View Post
That's a pretty safe bet given that the great majority of TT travel happens in the summer. You'd have to factor that into the equation.
Yea, I thought about that a bit too after I posted the poll. It will skew the results, but I also think there's a fair part of summer camping that is done where temps are lower than 80-85 F.

Quote:
Originally Posted by Bluegrass View Post
I was surprised about your Kumho's. Don't they have a significantly higher load rating than the Marathons?
Yes, they are rated for quite a bit more, and that's what is giving me pause to think about what else can be contributing to failure. My Kumhos were only 3 years old, and I took good care of them.

The 205 75/R14 Marathons are C load tires, with a rating of 1760 lbs. The 205 R14 Kumho 857 tires are D load tires, with a rating of 2271 lbs. That gives the Kumhos an extra 1,000 lbs of capacity.

My new 225 75/R15 Carlise tires are E load tires, with a rating of 2830 lbs. That's over 2,100 lbs MORE than what the Marathons are rated for, although that is at 80 psi, which I have demonstrated is too high of a pressure to run at -- it beats the trailer to crap. After doing that for a few hundred miles, I deflated to 70 psi, in part because I read about someone here running E range Maxxis tires at 70 psi (on scout trailers as well) with no problems. That improved the ride quite a bit, and with either pressure, they are running 10-20 degrees higher than ambient temp. And I weighed the TM on our trip, and we are right at the max at ~4,100 lbs.

Incidentally, Tirerack now has 2 listings for 205 75/R14 Marathons. One listing is for a tire made in China, the other is for a tire made in either the U.S. or Canada. Maybe that's a contributing factor.....were trailer tire failures such an issue 20-30 years ago when tires were domestically manufactured? Probably hard to tell, at least for us, because that was long before the internet.

http://www.tirerack.com/tires/tires....omCompare1=yes

Dave
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Old 08-04-2010, 07:04 PM   #9
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Any more responses?

So far, of the 21 tire failures reported:

15 (71%) occurred with temps above 80 degrees
6 (29%) occurred with temps below 80 degrees

I'm not surprised that more failures occurred in the warmed weather, but I am a little surprised at the number of failures in cooler weather. Perhaps ambient temp is not as relevant as I thought.

Dave
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Old 08-04-2010, 07:17 PM   #10
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do you have any statistics on speed during blowouts?
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